1) No Deathmatch, this is TTT. Only do things that serve your team to win!
2) Tester is not mandatory.
3) Detective can do everything as long as it serves as a method to win.
4) Traitor are not allowed to camp.
5) Do not behave in a bad way that could harass someone else. Treat others how you want to be treated.

We had a big ruleset in the past, but now we think this is not necessarry. We do not want to limit the fun factor in the game. And the Karma system as well as a report from time to time should do the thing.